store

Right now, this iterates over all items in the changelog and
calls the individual methods that handle single item states
or node references objects. Properly implemented, this method
should ensure that changes are either written completely to
the underlying persistence layer, or not at all.
Atomically saves the given set of changes.

checkConsistency

This implementation does nothing.
Perform a consistency check of the data. An example are non-existent
nodes referenced in a child node entry. The existence of this feature and
the scope of the implementation can vary in different PersistenceManager
implementations.